***PLEASE FOLLOW THROUGH ON YOUR PURCHASE ALL THE WAY from ADD TO CART THROUGH TO THE END to PAYING with PAYPAL and PAY FOR YOUR BOOK(S)at the TIME OF CREATING THE ORDER. IT is the ONLY way to secure your order and not create an invoice error. IF your order is not PAID IMMEDIATELY there is always a chance that someone else will purchase and pay for the same item before you do. Your items WILL ONLY BE SHIPPED IF the order is PAID IN FULL at the time of the order. THANKS!